11. Respiration occurs
A. independent of cellular activity.
OB. on the internal level only.
C. externally and internally.
OD. on the external level only.

Respiration occurs externally and internally.

Explanation:

Respiration is the metabolic process of converting  the energy stored in biological molecules to usable energy inform of ATP.  Respiration can be categories into three types; internal, external and cellular respiration.

EXTERNAL  RESPIRATION

this is the process which involves breathing in (inhalation) and breathing out (exhalation) of gases.

INTERNAL RESPIRATION

When gases are exchanged between blood and body cells its said to be  external respiration.

CELLULAR RESPIRATION

This involves the process by which food gets converted to energy and this is either aerobically ( needs oxygen) or anaerobically ( does not require energy.

so if you eat a 2000-calorie diet, you should aim for about 225 to 325 grams of carbs per day.

but if you need to lose weight, you will get much faster results eating around 50 to 150 grams of carbs.

in fact, a popular alternative called the low-carb diet has been shown to be much more effective for weight loss than the high-carb diet that has been recommended for the past few decades.

this diet restricts your intake of carbohydrates like sugars and starches (breads, pasta, etc.) and replaces them with protein, fat and healthy vegetables.

studies show that low-carb diets reduce your appetite and make you eat fewer calories and lose weight pretty much effortlessly, as long as you manage to keep the carbs down (1trusted source).

in studies where low-carb and low-fat diets are compared, the researchers need to actively restrict calories in the low-fat groups to make the results comparable, but the low-carb groups still usually win (2trusted source, 3trusted source).

low-carb diets also have benefits that go way beyond just weight loss. they lower blood sugar, blood pressure and triglycerides. they raise hdl (the good) and improve the pattern of ldl (the bad) cholesterol (4trusted source, 5trusted source).

low-carb diets cause more weight loss and improve health more than the calorie restricted, low-fat diet still recommended by many people. this is pretty much a scientific fact at this point (6, 7, 8trusted source).

explanation:

there are many studies showing that low-carb diets are more effective and healthier than the low-fat diet that is still recommended by many people.

all the above is what i would say